Sora with a different hairstyle in the Reality app
It was briefly shown in this old VOD
https://youtu.be/M0SJnyrfXg4?t=340sAlso an old 3D model of A-chan (with a weird 'A' hairpin) with Sora in some VR chatroom event or something
https://youtu.be/M0SJnyrfXg4?t=73s